FISHES OF THE FAMILY LORICARIID®. 271 
Key to the Species. 
I. Lips both well developed, papillose, with short marginal fringes; barbel not, or not much, 
longer than diameter of eye; teeth in equal number in both upper and lower jaw, 6-10 
on each side; a more or less distinct enlarged anal plate or pair of plates. (Rhineloricaria 
Blkr.) 
A. Abdomen completely covered with plates to the level of the base of pectoral or beyond. ' 
1. Supraoccipital with 1 or a pair of serrated keels ; lateral keels sharp, separate through- 
out ; abdomen with 2 or 3 series of plates between the lateral series ; uppermost 
caudal ray elongate. 
31-32 scutes in a geen series ; anal plate bordered anteriorly 
ibygseveral@gr sae Saar - . . . I. ZL. filamentosa Stdr. 
29 scutes in a longitudinal series ; “se site ue teed anteriorly 
LyjoUes, Pree ees A ieee Ts el wes 2 Oe Ee nigricauda Regn. 
2. Supraoccipital with weak or obtuse keels or none; lateral keels weak or obtuse, 
usually completely united posteriorly. 
a. Both outer rays of caudal produced (? L. phozocephala) ; a blackish stripe on each 
side of the snout running forward from the eye ; 28-30 scutes in a longitudinal 
series ; abdomen with 3 or 4 series of plates between the lateral series; breadth 
of head 12-14 times in its length. 
Diameter of eye 64 times in the length of head, interorbital width 
3-31 times (in a specimen of 100 mm.); snout rounded 
anteriorly. Pectoral spine extending to anterior } of ventral. 3. L. parva Blgr. 
Diameter of eye 7 times in the length of head, interorbital width 
33 times (in a specimen of 140 mm.); snout pointed. 
Pectoral spine extending to base of ventral ora little beyond. 4. L. phoxocephala Eigmn. 
Diameter of eye 9 times in the length of head, interorbital width 
3-3} times (in a specimen of 130 mm.). Pectoral spine not 
reaching base of ventral. . . ... =... . =... . 5. L. lanceolata Gthr. 
6. Uppermost ray of caudal very stout and strong, apparently not produced; 28-30 
scutes in a longitudinal series; abdomen with 3 or 4 series of plates between 
the lateral series. 
Breadth of head 13-13 times in its length, length of snout 14-2 
times ; pectoral spine extending to base of ventral. . . . 6. L.jubata Blgr. 
Breadth of head 14-1? times in its length, length of snout 2-24 
times ; pectoral spine a eae 3-2 of the distance from its 
origin to the ventral. . . . : . . . . %. L. uracantha Kner & Stdr. 
c. Uppermost ray of caudal ee (2 L. cadee and L. ete Ser 25-30 scutes in 
a longitudinal series ; abdomen with 3 or 4 series of plates between the posterior 
ones of the lateral series. 
a. Scutes in front of dorsal not or very obscurely carinate. 
Breadth of body at level of first anal ray about 5 times in the 
distance from that point to the caudal; first dorsal ray as 
long as or a little longer than the head ; interorbital width 
VOL. XVII.—PART. 11. No. 11.—October, 1904. 
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